Distinguish private and external costs and benefits
Identify effects on third parties that are not fully reflected in a business transaction and assess who bears them.
Exam scope and assessment notes
Cambridge IGCSE Business Studies 0450, 2026 syllabus, Version 2. Use the 2026 A*–G route; this qualification changes to 0264 for first assessment in 2027. Candidates are not assessed on constructing income statements or statements of financial position, nor on price-elasticity or exchange-rate calculations. Simple cash-flow forecast construction is assessed. Written practice is self-checked, not an official Cambridge grade; timed-paper evidence and human subject-teacher review remain outstanding.
Before you begin
- No previous study of external influences is assumed. Identify who is affected, which business decision changes and what evidence or condition would affect the outcome.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes an effect external?
What you will learn
- Define external costs and benefits
- Separate private effects from third-party effects
- Apply the distinction to a business decision
Ask who experiences the effect
A private cost or benefit falls on the business making a decision or a party directly involved in the transaction. An external cost or benefit affects a third party not fully represented in that transaction.
Factory noise that disrupts nearby residents can be an external cost. A firm's payments for its own electricity are private costs. A business activity that improves a nearby public space may create an external benefit for people who were not the direct customers.
Make the third-party link explicit
Do not label every cost beyond the business as external. Identify the affected person or group, explain the effect and show why it is not fully included in the business's own transaction or accounts.
External effects can influence local welfare and regulation. The business may respond through controls, compensation or changed practices, but the effectiveness and cost of each action need evidence.
Pause and explain
Which may be an external benefit?
Worked example
A factory pays its electricity bill but its delivery lorries create noise that interrupts nearby residents. Classify each effect.
Show the worked solution
- The electricity bill is paid by the factory as part of its operations.
- Residents are third parties to the factory's sales.
- Noise imposed on residents may be an external cost if not fully accounted for.
Answer The electricity bill is a private business cost. The noise experienced by nearby residents may be an external cost because they are third parties and the disruption is not necessarily included in the factory's transaction.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A factory's production creates jobs for its employees and dust that affects nearby farms. Identify one direct benefit and the possible external cost.
Give me a hint
Employees transact with the business; nearby farms may be third parties affected by production.
Compare my reasoning
- Wages and jobs are direct employment effects.
- Dust may harm crops on nearby farms.
- Explain that the farms bear a cost outside the factory's sale if it is not fully compensated.
The jobs and wages benefit employees directly through employment. Dust damaging nearby crops may be an external cost to farmers if the effect is not fully included in the factory's costs or compensated.
Look for these in your work
- Affected groups separated
- Third party named
- External link qualified
A business pays a contractor to remove waste, and residents experience less litter in a shared area. Classify the payment and the residents' effect.
Give me a hint
The contractor payment is a firm expense; the residents may benefit beyond the contract.
Compare my reasoning
- Waste removal is a private cost paid by the business.
- Residents are not necessarily parties to the contract.
- Cleaner shared surroundings may be an external benefit to them.
The contractor's fee is a private business cost. Residents may receive an external benefit from a cleaner shared area, even if they were not parties to the waste-removal contract.
Look for these in your work
- Private cost identified
- Residents identified as third parties
- Benefit explained
A delivery depot brings jobs to a town but increases traffic for nearby residents. Explain why both effects should be considered in a location decision.
Give me a hint
The decision can create benefits and costs for different groups.
Compare my reasoning
- Workers may gain employment and income.
- Residents may face congestion or noise.
- Compare scale, affected groups and possible mitigation.
The depot may support employment and local income while imposing congestion or noise costs on residents. A sound location decision considers both groups, measures the effects where possible and examines traffic routes or operating hours as mitigation.
Look for these in your work
- Two effects distinguished
- Groups identified
- Evidence and mitigation included
Common mistakes
- Calling a firm's own wage bill an external cost
- Naming an effect without identifying the third party
- Assuming every community effect is measurable from the case
What can you explain now?
What makes an effect external?
Compare with the explanation
It affects a third party outside the transaction
The third party is not fully represented in the direct exchange.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Who must experience an effect for it to count as external to a business transaction?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.